Update README.md

Author: bkrem

README.md

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 # React D3 Tree
 [![Build Status](https://travis-ci.org/bkrem/react-d3-tree.svg?branch=master)](https://travis-ci.org/bkrem/react-d3-tree)
 [![Coverage Status](https://coveralls.io/repos/github/bkrem/react-d3-tree/badge.svg?branch=master)](https://coveralls.io/github/bkrem/react-d3-tree?branch=master)
-[![npm](https://img.shields.io/npm/v/react-d3-tree.svg)](https://www.npmjs.com/package/react-d3-tree)
+[![npm version](https://badge.fury.io/js/react-d3-tree.svg)](https://badge.fury.io/js/react-d3-tree)
 
 React D3 Tree is a [React](http://facebook.github.io/react/) component that lets you represent hierarchical data (e.g. ancestor trees, organisational structure, package dependencies) as an animated & interactive tree graph by leveraging [D3](https://d3js.org/)'s `tree` layout.